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2019-04-19libcamera: ipu3: Create camera with 2 streamsJacopo Mondi
Sub-class the Stream class with an IPU3-specific implementation and create each IPU3 camera with two streams: 'output' and 'viewfinder' which represent the video streams from main and secondary ImgU output respectively. Rework stream configuration to handle the two video streams 'output' and 'viewfinder' separately. As the IPU3 driver requires viewfinder and stat video nodes to be started not to stall ImgU processing, configure 'output', 'viewfinder' and 'stat' regardless of the user-requested active streams. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-19libcamera: camera: Reset basefield to decimalJacopo Mondi
When logging the camera configuration, the same ostringstream instance is used to assemble a message describing configuration of all the configured streams. After the first stream configuration has been assembled, the use of std::hex modifies the ostringstream basefield, causing all successive integers values inserted in the stream to be expressed as hexadecimals. Fix that by resetting the stream's basefield to decimal, before assembling a stream configuration description. Before this patch: INFO Camera camera.cpp:615 (0) 640x480-0x3231564e (1) 140xa0-0x3231564e After this patch: INFO Camera camera.cpp:616 (0) 640x480-0x3231564e (1) 320x160-0x3231564e Fixes: 9c9078133216 ("libcamera: camera: Log requested configuration in configureStreams()") Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-19libcamera: stream: Document protected membersJacopo Mondi
Since commit: 4e1dc9004fca ("libcamera: stream: Make Stream inheritable") the private members of the Stream class have been turned into protected, to allows subclasses to access them. As Doxygen generates documentation for protected members (but not for private memebers), add documentation to the stream class for the 'bufferMap_' and 'configuration_' members. Fixes: 4e1dc9004fca ("libcamera: stream: Make Stream inheritable") Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-19libcamera: Include header related to source file firstLaurent Pinchart
Include the header file corresponding to the source file in the very first position. This complies with the Google C++ coding style guideliens, and helps ensuring that the headers are self-contained. Three bugs are already caught by this change (missing includes or forward declarations) in device_enumerator.h, event_dispatcher_poll.h and pipeline_handler.h. Fix them. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-19libcamera: stream: Add and use toString() method to StreamConfigurationLaurent Pinchart
Add a toString() method to the StreamConfiguration class, and replace all manually coded implementations through the source code. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-19libcamera: pipeline: rkisp1: Don't hardcode NV12 in configureStreams()Laurent Pinchart
Use the pixel format requested by the application in the RkISP1PipelineHandler::configureStreams() method instead of hardcoding NV12. The streamsConfiguration() method still proposes NV12 by default. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-19libcamera: Document documentation style and update the code accordinglyLaurent Pinchart
The documentation style for the Doxygen comment blocks is inconsistent in the library. Document the expectations and update all existing comment blocks to match. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: pipeline: Add RKISP1 pipelineLaurent Pinchart
The pipeline handler for the Rockchip ISP creates one camera instance per detected raw Bayer CSI-2 sensor. Parallel sensors and YUV sensors are not supported yet. As the ISP has a single CSI-2 receiver, only one camera can be used at a time. Mutual exclusion isn't implemented yet. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: pipeline: ipu3: Use the new CameraSensor classLaurent Pinchart
Replace the manual handling of sensor formats with usage of the new CameraSensor class. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: camera_sensor: Add a new class to model a camera sensorLaurent Pinchart
The CameraSensor class abstracts camera sensors and provides helper functions to ease interactions with them. It is currently limited to sensors that expose a single subdev, and offer the same frame sizes for all media bus codes, but will be extended to support more complex sensors as the needs arise. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: v4l2_subdevice: Add method to retrieve the media entityLaurent Pinchart
Add a method to retrieve the media entity associated with a subdevice. The entityName() and deviceNode() methods are not needed anymore as they can be accessed through the media entity, remove them. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: v4l2_subdevice: Close subdevice when destroyedLaurent Pinchart
Make sure the subdevice file descriptor isn't leaked by closing it when the V4L2Subdevice instance is destroyed. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: utils: Add set_overlap() functionLaurent Pinchart
The new set_overlap() function counts the number of overlapping elements in the intersection of two sorted ranges defined by their beginning and ending iterators. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: geometry: Add comparison operators to geometry classesLaurent Pinchart
Add equality and inequality comparison operators for the Rectangle, Size and SizeRange classes. For the Size class, also add ordering operators. Sizes are first compared on combined width and height, then on area, and finally on width only to achieve a stable ordering. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: geometry: Use Size to store min and max in SizeRangeLaurent Pinchart
Instead of storing four integers for the minimum and maximum width and height in the SizeRange class, use two instance of the Size class for the minimum and maximum sizes. While it at replace the mention of image size with size in the SizeRange documentation, as the Size class isn't limited to image sizes. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: geometry: Sort classes alphabeticallyLaurent Pinchart
Move the Size class before the SizeRange class. No functional change. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: camera: Log requested configuration in configureStreams()Laurent Pinchart
The IPU3 pipeline handler logs the requested configuration in its configureStreams() handler. This is useful for other pipeline handlers as well, move it to the Camera class. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: log: Mark Loggable::_log() methods as constLaurent Pinchart
The methods don't modify the object instance, mark them as const. This allows using the LOG() macro from a const method of a Loggable object. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18Install the cam and qcam utilitiesLaurent Pinchart
The cam and qcam utilities are meant to be shipped with libcamera, install them by default. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: buffer: Store Request reference in BufferJacopo Mondi
Add to the Buffer class methods to set and retrieve a reference to the Request instance the buffer is part of. As buffers outlive the Request they are associated with, the reference is only temporary valid during the buffer completion interval (from when the buffer gets queued to Camera for processing, until it gets marked as completed). Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: request: Expose the Stream to Buffers mapJacopo Mondi
Add to the Request class a method to access the map of Stream to Buffer. With the introduction of multiple stream support, pipeline handler should be able to access the map of streams at request queueing time. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: camera: Validate Request before queueing itJacopo Mondi
Extend the Request::prepare() operation to validate the request before preparing it. Return an error if the request is invalid, which for now is limited to ensuring that the request contains at least one buffer. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: request: Add hasPendingBuffers() methodJacopo Mondi
Add method to verify if a request has pending buffers yet to be completed. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: v4l2_device: Propagate releaseBuffers() errorJacopo Mondi
The error code returned by requestBuffers(0) was not propagated to the caller. Fix it. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-18libcamera: camera: Don't call freeBuffer() on allocateBuffer() errorJacopo Mondi
Do not assume the freeBuffer() function can handle allocateBuffer() method failures, as error handling and clean up should be performed by allocateBuffer() method itself. Perform clean-up on allocations failures in the IPU3 pipeline handler, now that freeBuffers() is not called anymore. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-17libcamera: camera: Pass the stream set to allocate/freeBuffers()Jacopo Mondi
Pipeline handlers might need to perform allocation of internal buffers, setup operations, or simple sanity check before going into the per-stream buffer allocation. As of now, PipelineHandler::allocateBuffers() is called once for each active stream, leaving no space for stream-independent configuration. Change this by providing to the pipeline handlers the full set of active streams, and ask them to loop over them to perform per-streams memory allocations and freeing. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-14libcamera: pipeline_handler: Add missing forward declaration of StreamUsageNiklas Söderlund
When switching to stream usages in the PipelineHandler StreamUsage was was not forward declared as it should and was hid by other include files, fix this. Fixes: 20a6455e0b62575b ("libcamera: camera: Add support for stream usages") Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-04-09libcamera: Add missing header files to meson.buildNiklas Söderlund
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-09cam: Allow cameras with more than one streamNiklas Söderlund
The libcamera API and the cam tool are now ready to make use of cameras with more than one stream. Remove the limitation in the tool which disallows cameras that provide more than one stream. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-09cam: Extend request completion handler to deal with multiple streamsNiklas Söderlund
The completion handler needs to handle all buffers in the request. Solve this by iterating over all buffers in the completed request. The streams are named automatically streamX, where X is the order in which the stream was passed to configureStream(). Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-09cam: Add support to specify multiple stream configurations with rolesNiklas Söderlund
Extend the cam tool to allow configuring more than one stream. Add an optional parameter to the --stream option to specify a usage role for the stream. The stream role is passed to libcamera to give it control over which streams to use. To support multiple streams, creation of requests needs to be reworked to limit the number of requests to match the stream with the least number of buffers. This should be improved in the future as the tool and the library evolve. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-09cam: Extend BufferWriter to include a stream name in file pathNiklas Söderlund
To be able to write multiple buffers captured in the same request (and hence having the same sequence number) the buffer writer needs to name each file uniquely. Add a stream name to the writer function which the buffer writer can add to the part of the pattern it already expands to the sequence number. As cam only supports one stream, hard code the name to stream0. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-09cam: Rename --format to --streamNiklas Söderlund
More than format information needs to be supplied for each stream to allow multiple streams to be configured. Rename the option and adapt all usages of it. There is no functional change except the rename. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-09libcamera: Switch to CameraConfigurationNiklas Söderlund
Implement the camera configuration thru out the library, tests, cam and qcam tools. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-09libcamera: camera: Add CameraConfigurationNiklas Söderlund
To properly support both multiple streams and stream usages the library must provide a method to map the stream usages to the returned streams configurations. Add a camera configuration object to handle this mapping. Applications can iterate over the returned camera configuration to retrieve the streams selected by the library in the same order as the usages it provided to the library. Applications can use the operator[] to retrieve the stream pointer and the stream configuration. Using a numerical index retrieves the stream pointer, the numerical indexes corresponds to the insertion order of usages in the CameraConfiguration, using the stream pointer retrieves the stream's configuration. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-05libcamera: camera: Add support for stream usagesNiklas Söderlund
Instead of requesting the default configuration for a set of streams where the application has to figure out which streams provided by the camera is best suited for its intended usage, have the library figure this out by using stream usages. The application asks the library for a list of streams and a suggested default configuration for them by supplying a list of stream usages. Once the list is retrieved the application can fine-tune the returned configuration and then try to apply it to the camera. Currently no pipeline handler is prepared to handle stream usages but nor did it make use of the list of Stream IDs which was the previous interface. The main reason for this is that all cameras currently only provide one stream each. This will still be the case but the API will be prepared to expand both pipeline handlers and applications to support streams usages. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-05libcamera: stream: Add basic stream usagesNiklas Söderlund
In preparation of reworking how a default configuration is retrieved from a camera add stream usages. The usages will be used by applications to describe how they intend to use a camera and replace the Stream IDs when retrieving default configuration from the camera using streamConfiguration(). Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-05libcamera: Make geometry.h a public headerNiklas Söderlund
Make the geometry header public so it can be used by the API facing applications. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-04-04cam: Rework how streams configuration is preparedNiklas Söderlund
In preparation of reworking how a default configuration is retrieved from a camera separate preparation of stream configuration and application into two different functions. Reason for this is that preparation of camera configuration will become more complex. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03qcam: meson: Use pkg-config method for qt5 dependenciesKieran Bingham
Meson searches for qmake to determine if QT5 is available to support the optional qcam component. When cross compiling, meson can incorrectly identify the host qmake which will cause incorrect linkage and usage of system headers. Set the dependency method to specify pkg-config which resolves the issue. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-04-03libcamera: ipu3: Catch return value when disabling linksKieran Bingham
Ensure that any error from the disableLinks() call during match() is propogated to the caller. Fixes: d698ed27494a ("libcamera: ipu3: Create ImgUDevice class") Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-04-03libcamera: ipu3: Enable ImgU media linksJacopo Mondi
As the lengthy comment reports, link enable/disable is not trivial, as links in one ImgU instance interfere with capture operations in the other one. As it is not yet clear if this behaviour is intended, as of now reset the media graph during pipeline's match() and enable the required links at streamConfiguration time. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03libcamera: ipu3: Limit resolution to 2560x1920Jacopo Mondi
As the procedure to configure the intermediate sizes and the alignement requirements of the ImgU device have not been clarified yet, return as default configuration the (2560x1920) resolution that has been validated for both cameras. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03libcamera: ipu3: Set stream configurationJacopo Mondi
Use the cached sensor maximum resolution and the pixel format generated by the ImgU output devices as default stream configuration. While at it, replace the hardcoded numerical value for the number of buffers with a named constexpr. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03libcamera: ipu3: Connect CIO2 and ImgU bufferReady signalsJacopo Mondi
Connect the CIO2 output bufferRead signal to a slot that simply queue the received buffer to ImgU for processing, and connect the ImgU main output bufferReady signal to the cameraData slot that notifies to applications that a new image buffer is available. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03libcamera: ipu3: Queue requests to ImgUJacopo Mondi
Implement queueRequest for the IPU3 pipeline manager. When a request is queued, a new buffer is queued to the ImgU output for capture. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03libcamera: ipu3: Implement camera start/stopJacopo Mondi
Start and stop video devices in the pipeline. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03libcamera: ipu3: Implement memory handlingJacopo Mondi
Implement buffer allocation and release in IPU3 pipeline handlers. As the pipeline handler currently supports a single stream, provide two internal buffer pools for 'viewfinder' and 'stat' video devices, and export the 'output' video device buffers to the stream's pool. This works around the fact that the ImgU requires buffers to be queued on all its outputs, even when they are not in use. Share buffers between the CIO2 output and the ImgU input video devices, as the output of the former should immediately be provided to the latter for further processing. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03libcamera: ipu3: Apply image format to the pipelineJacopo Mondi
Apply the requested stream configuration to the CIO2 device, and propagate formats through the the ImgU subdevice and its input and output video devices. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-04-03libcamera: ipu3: Create ImgUDevice classJacopo Mondi
Group ImgU components in a class associated with a camera at camera registration time and provide an intialization method to create and open all video devices and subdevices of the ImgU. Statically assign imgu0 to the first camera and imgu1 to the second one and limit support to two cameras. This will have to be revised in the future. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>